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Effect of Herbicides on the Growth, Yield Components and Yield of Brll Paddy

A. B. ZIAUDDIN HOSSAIN
Department of Botany. University of Chittagong, Chittagong

MD. AZIZUR RAHMAN
Department of Botany. University of Chittagong, Chittagong

Abstract/ Executive Summary:

Eleven treatments with three herbicides were applied on BR11 paddy field to control weeds and also to study the growth, yield components and yield. The effect of herbicides was found to be positive in controlling the weed species and in increasing the yield components and yield. The maximum number and length of tillers, length of panic le, area of flag leaves, number and percentage of filled grains, grain and straw yield per hectare were found at T₃ when normal dose of Rifit 500 EC was applied. Different doses of Machete 5G were also found effective in controlling weeds and increasing in yield .

Keywords: Weed, Herbicides , Paddy , Aman Season

Location: Chittagong

Start Date:

End Date:

Program Area: Pest Management

Commodity: Herbicide

Objectives:

In the present study three herbicides namely, Rifit 500 EC (Pretilachlor), Ronstar 25 EC (Oxadiazon) and Machete 5G (Butachlor) were applied in different doses in BR11 paddy grown in Aman season and their effect was studied on the control of weeds and ultimate yield components and yield of paddy .

Methodology:

The seeds of BR11 paddy were sown in seed bed of 3 m x 1m in the Botanical garden, University of Chittagong. 200 g of seeds were evenly sown in seed bed on 17 July 2004. Watering and weeding were done in the seed bed when required. The field for transplantation was prepared in the same area by ploughing and cross ploughing and leveled properly. The field was divided into 33 plots, each measured 4 m x 4 m. There were eleven treatments each with three replications (block) where Complete Randomized Design (CRD) was maintained. 24 days old seedlings were transplanted from seed bed to the field on 10 August 2004.Rifit 500 EC: It is applied on saturated soil and pre transplanting at any time up to weed emergence. It works as cell division inhibitor. It is a selective herbicide. It is taken up readily by the hypocotyls, mesocotyls and coleoptiles. It controls annual grasses, sedges and broad leaved weeds.Ronstar 25 EC: In transplanting rice, the depth of water should be at least 3 to 5 cm deep and be maintained at this level for 2 to 5 days after application. It inhibits Protoporphyrinogen oxidase. It works on annual grasses and broad leaves.Machete 5G: It is a protein synthesis inhibitor. It works as selective and systematic herbicide, absorbed primarily through germinating shoots and secondarily by roots; translocated throughout the plant, with higher concentration in the vegetative parts than the reproductive parts. It controls annual grasses and some broad leaves.

Source of Information: J. Asiat. Soc. Bangladesh , Sci. 39(1): 21-26, June 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present experiment, T3 was found to be most effective in increasing the yield components and yield of BR 11 paddy. At T4, double the dose of Rifit 500 EC was used where the yield did not increase accordingly. This may have toxic effect of the double the dose of Rifit. So, normal dose of Rifit 500 EC ( l.6ml/800ml water @ lL/ha) may be recommended

Knowledge Management: Journal